agent/Core/Controller/SendRequest.cpp in Phusion Passenger before 4.0.60 and 5.0.x before 5.0.22, when used in Apache integration mode or in standalone mode without a filtering proxy, allows remote attackers to spoof headers passed to applications by using an _ (underscore) character instead of a - (dash) character in an HTTP header, as demonstrated by an X_User header.
{
"nvd_published_at": null,
"severity": "LOW",
"github_reviewed_at": "2020-06-16T21:35:50Z",
"github_reviewed": true,
"cwe_ids": [
"CWE-20"
]
}